Thursday, October 16, 2014

Elements In Drawing Structural Steel Fabrication

By Estelle Larsen


It is imperative in the work of a drafter to finish with an individualized yet excellently technical drawing. After all, the line itself has very limited characteristics, but for product to be art and not just science, it should not hinder the artist. Black line works with liquidity and conformity are a must.

Because the birth of the concept of a building starts with its structural drawing, it is vital that the drafter should be able to explain well through lines and circles and his whole drawing what the creators have first imagined and visualized. The draftsman must prepare all accurately and in labored detail to implement what should be done such as in structural steel fabrication. Guidelines should be strictly heeded.

The basic lettering height and dimensioning is three over thirty two. Sketches should be numbered accordingly with the capital letter s hyphenated before the number of the sketch and should have height of one fourth or more. Scales are in standard feet and inches and must be always written. Indicate not to scale if the detail does not scale the notation. Otherwise, write scale as noted in the title block.

Every entity in the draft must contain a title. It could be an elevation, detail, symbols legend, plan view, or note column, among others. It should be large enough to catch attention and underlined, and the height ranges from one fourth to three eighths of an inch.

Deleted sections are depicted through section marks. They are circles with arrows, like in engineering. The circle is typically one half inch in terms of diameter. An forty five degree arrow directs the deletion. They can either be colored or left open. The title of the section view must be included in the upper half moon of the circle, while the sheet reference should me mentioned in the lower half moon part.

Structural presentations should also contain the north arrow as a reference to the components which they relate to. Drawing tools should be used as they are never made freehand. Color can be implemented to strike the viewer, but they should be simple.

The title blocks have seven lines of information, in order. Prepared according to company specs, they contain name and address of client, name and address of structural company, date the draft has been finished, drawing scale, drawing number, and the stamp of the engineer. Centered or in a flush margin, title blocks should always be complete.

If there were any revisions done before the work of the draftsman has been given the thumbs up, they will be remarked in the revision blocks. All materials for construction of the framework should also be enumerated in the bill of materials section. As for the layout, the sheet should be framed by a border, typically half of an inch with regards of line.

The line work should strictly follow the recommended standards, with arrowheads either drawn open, closed, solid, or traditional. Local and general notes should be placed horizontally on the sheet and abbreviations are strongly discouraged. Do not forget to reference each note with a number, and spacing should make the notes distinguishable from each other.




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